Custom Woolen Mills 100% wool fill comforters, mattress pads, sleeping bags and pillows have been sewn in the same way for over 70 years. Our quilting machine was invented and hand-built by John Weselowski in 1945 at his Sifton, Manitoba mill. The distinct stitching pattern is unique to Custom Woolen Mills and is a cherished symbol of our all-natural bedding products. We sew between six and ten comforters a day, depending on the size.